Uptime robot is free monitoring tool which will allow you to monitor up to 50 websites at regular 5 minutes interval and sends you an instant alerts when any of your website is down. Dashboard is user friendly, you don't have to be an expert to use this web based free tool. Site link is given below.
http://www.uptimerobot.com/
You can also try the server monitoring service from Monitive, they have a free trial that you can try. I have tried several web monitoring service before, so far monitive is the best that I tried.
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